Convert Windows TCHAR argv list to classical char * argv

http://www.wincli.com/?p=72

 

 

Many people used to classical C have hard time adopting the code to Windows types. The code below illustrates one of the frequent questions: how to use TCHAR arguments with good old code expecting char * in arguments with minimum blood?

#include "stdafx.h"
#include "stdio.h"
#include "stdlib.h"


// returns number of TCHARs in string
int wstrlen(_TCHAR * wstr)
{
   int l_idx = 0;
   while ((( char *)wstr)[l_idx]!=0) l_idx+=2;
   return l_idx;
}


// Allocate char string and copy TCHAR->char->string
char * wstrdup(_TCHAR * wSrc)
{
   int l_idx=0;
   int l_len = wstrlen(wSrc);
   char * l_nstr = ( char *) malloc (l_len);
   if (l_nstr) {
       do {
          l_nstr[l_idx] = ( char )wSrc[l_idx];
          l_idx++;
       } while (( char )wSrc[l_idx]!=0);
   }
   nstr[l_idx] = 0;
   return l_nstr;
}



// allocate argn structure parallel to argv
// argn must be released
char ** allocate_argn ( int argc, _TCHAR* argv[])
{
   char ** l_argn = ( char **) malloc (argc * sizeof ( char *));
   for ( int idx=0; idx<argc; idx++) {
       l_argn[idx] = wstrdup(argv[idx]);
   }
   return l_argn;
}

// release argn and its content
void release_argn( int argc, char ** nargv)
{
   for ( int idx=0; idx<argc; idx++) {
       free (nargv[idx]);
   }
   free (nargv);
}


////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// Use exampe:
////////////////////////////////////////////////////////////////////////

int _tmain( int argc, _TCHAR* argv[])
{
   char ** argn = allocate_argn(argc, argv);
   // Optionally #define argv argn
   if (argc>1) {
           printf (“Arg 1 = ‘%s’\n”, argn[1]); // Just argn intead of argv
   }
   release_argn(argc, argn);
   return 0;
}